%0 Journal Article
%T Silica-Grafted Ionic Liquids as Recyclable Catalysts for the Synthesis of 3,4-Dihydropyrano[c]chromenes and Pyra-no[2,3-c]pyrazoles
%A Khodabakhsh Niknam
%A Abolhassan Piran
%J Green and Sustainable Chemistry
%P 1-8
%@ 2160-696X
%D 2013
%I Scientific Research Publishing
%R 10.4236/gsc.2013.32A001
%X <span>Silica-grafted </span><i><span>N</span></i><span>-propyl-imidazolium hydrogen sulfate ([Sipim]HSO<sub>4</sub>) is employed as a recyclable heterogeneous ionic liquid catalyst for the synthesis of 3,4-dihydropyrano[c]-chromenes by the reaction of aromatic aldehydes, malononitrile and 4-hydroxycoumarin at 100กใ</span><span>C<span> under solvent-free conditions. Also, heterogeneous ionic liquid catalyst was used for the synthesis of pyrano[2,3-c]-pyrazoles by the reaction of aromatic aldehydes, malononitrile and 3-methyl-l-phenyl-</span></span><span>5-pyrazolone at 110กใ</span><span>C<span> under solvent-free conditions. The heterogeneous ionic liquid showed much the same efficiency when used in consecutive reaction runs</span>.</span><span></span>
%K Silica-Grafted &lt
%K i&gt
%K N&lt
%K /i&gt
%K -Propyl-Imidazolium Hydrogen Sulfate
%K Aldehydes
%K Pyrano[2
%K 3-c]-Pyrazoles
%K 3
%K 4-Dihydropyrano[c]-Chromenes
%K Solvent-Free
%K Heterogeneous Ionic Liquid Catalysts
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=31420